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article

Selected areas and results of the activities of the National Institute of Cultural Heritage for the protection and care of monuments in the years 2015-2019

Tomasz Landmann

Scientific Journal of the Military University of Land Forces > 2022 > Vol. 54, No. 2(204) > 196--213

In the article, the subject of considerations is the effects of actions of the National Institute of Cultural Heritage in selected areas of monument protection and care in the years 2015-2019. The undertaken subject corresponds to the protection of cultural heritage in the context of strengthening the cultural security of the Republic of Poland. The purpose of the considerations is to present the...

article

Threats to the security of Polish military contingents in the UN forces on the example of the PMC in Lebanon – experiences and perspectives

Piotr Lotarski

Scientific Journal of the Military University of Land Forces > 2022 > Vol. 54, No. 2(204) > 293--308

This paper attempts to identify threats to the security environment of Lebanon and the prospects for their changes, affecting the activities of Polish military contingents and their personnel, taking into account historical aspects, internal and external threats and contemporary conditions of the security environment of the region and Lebanon. It uses the results of research conducted by the author...

article

Effect of reaction time on the structure and optical properties of P3HT/MWCNT-OH nanocomposites

Mohd Nurazzi Norizan, Norli Abdullah, Siti Zulaikha Ngah Demon, Norhana Abdul Halim, more

Polimery > 2022 > Vol. 67, nr 5 > 205--211

In the present study, regioregular poly(3-hexylthiophene-2,5-diyl) (P3HT) coated hydroxylated multi-walled carbon nanotubes (MWCNT-OH) nanocomposites were prepared over different reaction times of non-covalent functionalization. The reaction time was set as 24, 48, 72, 96, and 120 hours. The structure and optical characteristics of nanocomposites were analyzed using Fourier-transform infrared (FTIR)...

article

Study on recovery of iron and sulfur from high-sulfur magnetite ore

Yongqiang Zhao, Wen-tao Zhou, Tichang Sun, Asadullah Ahmadzai

Physicochemical Problems of Mineral Processing > 2022 > Vol. 58, iss. 4 > art. no. 150889

In this paper, to produce a saleable magnetite concentrate with a sulfur level below 0.20% and recover sulfur concentrate, flotation and magnetic separation tests were undertaken. Results showed that the optimum conditions of flotation were established as follows: grinding fineness of 90% particles passing 0.074mm, pH 6, 400 g/t of CuSO4, and 400 g/t of combined collectors. Under these conditions...

article

Better color distribution uniformity and higher luminous intensity for LED by using a three-layered remote phosphor structure

Nguyen Thi Phuong Loan, Nguyen Doan Quoc Anh, Nguyen Cong Trang, Hsiao-Yi Lee

Materials Science Poland > 2022 > Vol. 40, No. 1 > 60--67

Angular color distribution uniformity has been one of the most relevant properties in the development of white light-emitting diodes (WLEDs), since color consistency and uniformity are crucial factors in quality evaluation of a WLED. Here, particularly considering the need to overcome the poor chromaticity usually associated with WLED, we introduce a new design for the remote-phosphor package, namely...

article

Biopolymers as renewable polymeric materials for sustainable development - an overview

Abhinav Srivastava, Atul Kumar Srivasatva, Ashutosh Singh, Priti Singh, more

Polimery > 2022 > Vol. 67, nr 5 > 185--196

Based on the review of 115 literature items, the article presents biopolymers as renewable polymer materials for sustainable development. The types of biopolymers and their applications are discussed, including biopolymers based on starch, cellulose, bacteria, soy and natural polyester. It also describes the issues of biocompatibility, the principles of sustainable chemistry and sustainable development,...

article

Novel N,N’-bis(2,4-dimethoxybenzylidene)ethylenediamine PVC membrane electrode for the potentiometric iron selective sensor based on Schiff base ligand

Sachin Kumar, Susheel Sandhu, Agnik K. Patel, Ketankumar H. Parmar

Polimery > 2022 > Vol. 67, nr 5 > 197--204

N,N’-bis(2,4-dimethoxybenzylidene)ethylenediamine was synthesized and used as a membrane carrier to create a novel poly(vinyl chloride) membrane potentiometric sensor that is selective especially for Fe³⁺ ions. The super-Nernstian slope of the projected sensor was 19.5 mV per decade over a concentration range of 7.3•10^-8–1•10^-1 M having detection limit at 7.3•10^-8 M. The sensor displayed a linear...

article

Sustainable Development and Sustainable Science. Where We Came From, Where We Are Now and Where We Are Heading? Part I: The History of the Concept

Magdaléna Drastichová

Problemy Ekorozwoju > 2022 > Vol. 17, nr 2 > 7--18

This work focuses on the origin, the history and milestones that led to the conceptualization of sustainable development (SD). Not only is the concept of SD broad, but it is often used interchangeably with the more general (but sometimes also more specific) concept of sustainability. The concept of SD is analysed based on its development and relationships with sustainability and related scientific...

article

Zwiększenie potencjału obronnego przez posiadaczy broni palnej w obliczu zagrożenia militarnego w Polsce

Waldemar Kaak, Joanna Olszewska

Przegląd Nauk o Obronności > 2021 > R. 6, Nr 12 > 82--97

Niniejszy artykuł wskazuje w jaki sposób posiadacze broni palnej w Polsce mogą wpłynąć na zwiększenie potencjału obronnego w obliczu zagrożenia militarnego. Na przykładzie konfliktu na Ukrainie, ustawodawca powinien stworzyć katalog norm, z których jasno wynikałoby prawo użycia broni palnej, w celach innych niż tych wskazanych w Ustawie o broni i amunicji. Artykuł w jasny sposób określa sytuacje,...

article

The impact of the war in Ukraine on changing Russia-Austria relations

Aleksandra Skrabacz

Przegląd Nauk o Obronności > 2021 > R. 6, Nr 12 > 50--65

Objectives: The article considers the changes that occurred in bilateral relations between Russia and Austria in the period before and after the start of the military invasion of Ukraine in February 2014. Austria, as the subject of the study, was chosen because of its peculiarities as a perpetually neutral country and state - member of the European Union. The country to shape its bilateral relations...

article

Realizm, interpretacja, poznanie : zagadnienie obronności w kręgu pytań zasadniczych

Stanisław Filipowicz

Przegląd Nauk o Obronności > 2021 > R. 6, Nr 12 > 66--81

Objectives: Powiązanie rozważań z zakresu nauki o obronności z refleksją filozoficzną dotyczącą zagadnienia realizmu. Podkreślenie fundamentalnego znaczenia kategorii interpretacji i rozumienia w kształtowaniu podstaw wiedzy powiązanej z pojęciem soft power. Methods: Wykorzystanie instrumentarium hermeneutyki - analiza struktur pojęciowych kształtujących osnowę zróżnicowanych i kolidujących ze sobą...

article

Influence of 2% titanium addition on microsctructure and selected high-temperature properties of a novel Co-based superalloy strenghtened with L1₂ phase

Milena Kierat, Maciej Liśkiewicz

Journal of Metallic Materials > 2021 > Vol. 73, no. 4 > 11--14

This paper contains selected results of primary microsctructure analysis of a novel superalloy, Co-20Ni-10Al-5Mo-2Nb-2Ti. Research on this class of superalloys was started by J. Sato in 2006, and further expanded by S.K. Makineni in 2015. It is implied that Co-based, W-free superalloys will resolve the issues that the aircraft industry currently faces with Ni-based γ/γ’ superalloys. It is believed...

article

Study on the influence of sheet straightening process on residual stress distribution, mechanical properties and structure of deep-drawing steel sheets

Krzysztof Radwański, Andrzej Adamiec, Roman Kuziak, Dariusz Zaława, more

Journal of Metallic Materials > 2021 > Vol. 73, no. 4 > 3--10

The article describes the impact of the stretch levelling process of DC03 and DC04 steel sheets on their quality in terms of further application for products formed in technologies used in the automotive industry. The straightening process was carried out in a demonstration line developed as part of a project carried out by DAR STAL Dariusz Zaława together with the Łukasiewicz Research Network - Institute...

article

Simulation of the effect laminate sequence on delamination mode-I with elastic couplings

Mustafa Abd Alhussein, Zuhair Abdul Ameer, Ahmed Fadhil Hamzah

Diagnostyka > 2022 > Vol. 23, No. 2 > no. art. 222211

A numerical study using the ANSYS 19.R3 environment is discussed in this research. This environment depends on the Virtual Crack Closure Technique (VCCT) method to test a double cantilever beam (DCB) according to the ASTM D5528 standard. Four kinds of laminate stacking sequences were considered. According to the results, the distribution of the strain energy release rates obtained along the delamination...

article

Numerical analysis and optimization of a winglet sweep angle and winglet tip chord for improvement of aircraft flight performance

Ali J. Dawood Al-Khafaji, Gennady S. Panatov, Anton S. Boldyrev

Diagnostyka > 2022 > Vol. 23, No. 2 > art. no. 222210

In this paper, a study of the effect of winglet sweep angle and winglet tip chord of the aircraft wing on the aerodynamics performances and how to improve it are carried out, assuming Cant angle 60°, winglet height = 3.5 m, Toe angle = -5°, and Twist angle = +5°. Different sweep angles tested (-25°, -15°, 0°, +15°, +25°, +35°, and +45°) and winglet tip chord (0.25, 0.375, and 0.5 m). Four Angle of...

article

Verification of the measurement system in a production organization

Miroslav Prístavka, Pavol Findura, Ivan Beloev, Maciej Kuboń, more

Agricultural Engineering > 2022 > Vol. 26, No. 1 > 81--90

Monitoring the accuracy of meters by qualified workers and managers is a preventive measure of every organization. The paper focuses on monitoring the accuracy of measuring devices and proposes preventive and corrective actions. The discussed measurement device was tested for accuracy using accuracy indexes Cg and Cgk. The identified deviations in measurements showed that the meter was not fully efficient...

article

Investigating the selectivity of calcium hypochlorite for flotation separation of chalcopyrite and pyrite pre-adsorbed collector

Wenhui Yang, Xianhui Qiu, Huashan Yan, Hao Wu, more

Physicochemical Problems of Mineral Processing > 2022 > Vol. 58, iss. 4 > art. no. 150703

Bulk flotation is usually used in the flotation of Cu-Fe sulfide ore, and the subsequent concentrate is difficult to be separated because the minerals have adsorbed the collector. In this paper, flotation tests showed that calcium hypochlorite (Ca(ClO)₂) had a stronger depression effect on pyrite pre-adsorbed sodium butyl xanthate (SBX), while having a negligible depressive effect on chalcopyrite...

article

A first-principle study of the effect of Fe/Al impurity defects on the surface wettability of dolomite

Hong Chen, Xianquan Ao, Yang Cao, Cuiqin Li, more

Physicochemical Problems of Mineral Processing > 2022 > Vol. 58, iss. 4 > art. no. 150702

The presence of Fe and Al atoms in large quantities in phosphate ores can significantly affect the surface properties of the minerals during flotation. In this study, the effects of Fe/Al impurities on the adsorption of H₂O molecules on dolomite, including the density of states (DOS), Mulliken bond group values, and charge groups, were investigated and the adsorption energy was analyzed using density...

article

Probabilistic Liquefaction Analysis Using Standard Penetration Test

Filali Kamel, Sbartai Badreddine

Studia Geotechnica et Mechanica > 2022 > Vol. 44, nr 2 > 162--174

The Youd etal liquefaction resistance curves developed in 2001 to characterize the cyclic resistance of soil based on SPT test are the most used in the context of the Seed and Idriss simplified procedure as a deterministic model. These curves were developed from a modified database of Seed etal. in 1985 with the assumption that the actual peak shear stress (τd) induced at depth h is always less than...

article

Rational methods of operation of underground gas storages and mitigation of energy losses

Oksana Chernova, Oleg Vytyaz, Rostislav Martyniuk, Irina Fedorovych

Nafta-Gaz > 2022 > R. 78, nr 3 > 187--196

The fuel and energy complex of Ukraine, like most developed countries of the world, is a complex system of material production incorporating a set of many subsystems that cover the extraction, conversion, distribution, storage and consumption of energy. Ukraine's gas transportation system has an extremely complex system, which consists of gas pipelines of various purposes and capacities, compressor...

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INFONA - science communication portal

Search results

Selected areas and results of the activities of the National Institute of Cultural Heritage for the protection and care of monuments in the years 2015-2019

Threats to the security of Polish military contingents in the UN forces on the example of the PMC in Lebanon – experiences and perspectives

Effect of reaction time on the structure and optical properties of P3HT/MWCNT-OH nanocomposites

Study on recovery of iron and sulfur from high-sulfur magnetite ore

Better color distribution uniformity and higher luminous intensity for LED by using a three-layered remote phosphor structure

Biopolymers as renewable polymeric materials for sustainable development - an overview

Novel N,N’-bis(2,4-dimethoxybenzylidene)ethylenediamine PVC membrane electrode for the potentiometric iron selective sensor based on Schiff base ligand

Sustainable Development and Sustainable Science. Where We Came From, Where We Are Now and Where We Are Heading? Part I: The History of the Concept

Zwiększenie potencjału obronnego przez posiadaczy broni palnej w obliczu zagrożenia militarnego w Polsce

The impact of the war in Ukraine on changing Russia-Austria relations

Realizm, interpretacja, poznanie : zagadnienie obronności w kręgu pytań zasadniczych

Influence of 2% titanium addition on microsctructure and selected high-temperature properties of a novel Co-based superalloy strenghtened with L1₂ phase

Study on the influence of sheet straightening process on residual stress distribution, mechanical properties and structure of deep-drawing steel sheets

Simulation of the effect laminate sequence on delamination mode-I with elastic couplings

Numerical analysis and optimization of a winglet sweep angle and winglet tip chord for improvement of aircraft flight performance

Verification of the measurement system in a production organization

Investigating the selectivity of calcium hypochlorite for flotation separation of chalcopyrite and pyrite pre-adsorbed collector

A first-principle study of the effect of Fe/Al impurity defects on the surface wettability of dolomite

Probabilistic Liquefaction Analysis Using Standard Penetration Test

Rational methods of operation of underground gas storages and mitigation of energy losses

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